I often tip the Service Dept shuttle driver for taking me and pick me up. They are minimum wage "service" employees.I learned a trick back in the 70's when I bought my first new car. I along with 10 others were waiting for service to be done. A gentleman driving an older Lincoln came in and within 15 minutes - they said he was done. I watched as he exited the waiting room. He stuck a $10.00 bill into the service writers hand and a $20.00 into the mechanics hand. Best $30.00 spent. I do the same today - It really pays off - they remember you.